目的探讨外伤性硬膜下积液演变为慢性硬膜下血肿的几率、机理和临床特点。方法回顾性分析%! 例外伤性硬膜下积液演变为慢性硬膜下血肿患者的临床资料及有关文献。结果本组16.7%膜下积液病例演变为慢性硬膜下血肿；积液演变为血肿的时间为伤后22～100d；经钻颅血肿引流均治愈。结论外伤性硬膜下积液是慢性硬膜下血肿的来源之一。发病年龄两极化，常发生在积液量少、保守治疗的慢性型病例中。致病方式常为减速性损伤及合并的颅脑损伤很轻微是外伤性硬膜下积液演变为慢性硬膜下血肿患者的临床特点。

Summary To probe the feasibility and utility of neuroendoscopic inspection of the anatomy of the cerebellopontine angle (CPA) and of neuroendoscopic assisted microneurosurgery (NEAMN) for CPA lesions via a retrosigmoid approach, we used retrosigmoid NEAMN in 28 patients with CPA lesions. Prior to this, we undertook anatomical observation of bilateral CPA in two adult cadaver heads using the neuroendoscope. NEAMN tumour resection was performed in eight acoustic neuromas, one meningioma and 14 cholesteatomas and NEAMN vascular decompression was performed in five patients with trigeminal neuralgia. Both the neurovascular structures of the CPA and the ventral surface of the pons, as well as the clivus, can be inspected using the neuroendoscope through a retrosigmoid approach with a 2-3 cm diameter bony opening. Complete excision of the tumour with preservation of the facial nerve was achieved in all eight acoustic neuromas. Likewise, total resection of the tumour was possible in the 14 cholesteatomas and one meningioma. Paroxysmal facial pain resolved after NEAMN vascular decompression in the five patients with trigeminal neuralgia. There were no postoperative complications or deaths in this series. The CPA can be divided into three levels-the cranial, medial, and caudal, and each level contains specific neurovascular structures as seen through the neuroendoscope. Knowledge of these divisions is useful to master the common NEAMN procedures of the CPA. NEAMN for CPA lesions via a retrosigmoid approach is a useful adjunct to standard microneurosurgical techniques effect and may decrease the operative risk.

目的探讨外伤性硬膜下积液演变为慢性硬膜下血肿的几率、机理和临床特点。方法回顾性分析%!例外伤性硬膜下积液演变为慢性硬膜下血肿患者的临床资料及有关文献。结果本组16.7%的外伤性硬膜下积液病例演变为慢性硬膜下血肿；积液演变为血肿的时间为伤后22～100D；经钻颅血肿引流均治愈。结论外伤性硬膜下积液是慢性硬膜下血肿的来源之一。发病年龄两极化，常发生在积液量少、保守治疗的慢性型病例中。致病方式常为减速性损伤及合并的颅 脑损伤很轻微是外伤性硬膜下积液演变为慢性硬膜下血肿患者的临床特点。

本文综合山东省11家医院经手术及病理证实的第三脑室胶样囊肿14例。占同期颅内肿瘤的0.14%。8例行脑室造影，6例CT扫描。经额入路手术切除13例，定向活检囊液抽吸排空1例，其中脑脊液分流术3例。治愈6例，好转7例，死亡1例。着重对其诊断与治疗进行了讨论。